Telephone set



APPLICATION FILED APR24| 1917- W. G. CRAWFORD.

TELEPHONE SET.

Patented Apr. 20, 1920.

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W. G. CRAWFORD.

TELEPHONE SET.

APPLICATION FILED APR. 24, 1917-.

1,337,692. Patented Apr. 20, 1920.

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Ven/0k.' .Wn/fer G. Crawford NTED STATES PTETNTI OFFCE,

YORK.

WALTER G. CRAWFORD, 0F NEW YORK, N. Y., ASSEGNO?, TO 1WESTERN' ELECTRICCOMPANY, INCORPORATED, 0F NEW' YCRK, N. 3.7

A CORPORATION OF NEW TELEPHONE SET.

Application filed April 24,

To all whom t may concern Be it known that I, ALTER Gr. CRAWFORD, acitizen of the United States, residingat New York, in the county of NewYork and State of New York, have invented certain new and usefulImprovements in Telephone Sets, of which the following is a full, clear,concise, and exact description.

This invention relates to telephone sets for use at the subscribersstations of telephone exchange systems, and particularly to telephonesets of the intercommumcating type. As a result of the differentconditions under which intercommunicating telephone sets may be calledupon to operate, there has been developed a large number of systems, andin many cases, the telephone sets for use in one system cannot be usedin a different system without considerable modification. Not only do thedifferent systems themselves necessitate diiferent sets, but in order tomeet the requirements of a single system, a large number of differentsets may be required, depending upon the number of sets to be placedupon a certain line, and whether these sets are to be of the flush orthe non-flush type.

Such a condition makes it necessary to carry a much greater stock oftelephone sets than would otherwise'be necessary and also results in aconsiderable increase in the cost of manufacture, and the cost kofhandling` the orders. In order to decrease, to a large extent, thenumber of different sets needed to meet the requirements of the varioussystems, it has been found desirable to resort largely to unit type ofconstruction, making the various parts interchangeable so far aspossible, and in that way allowing for easily converting a set adaptedfor one system into a set suitable for a different system,

The object of this invention is primarily to provide a unit constructionfor such a set, one which will lend itself readily to the diHerentconditions under which it may be assembled, and which will be economicalto manufacture.

To accomplish this object, the invention provides, in the first place.an apparatus mounting plate, upon which arepmounted the switchhook andthe terminal plate, equipped with the necessary number of terminals toprovide a flexible means for meeting the different circuit requirements.To facilitate the assembly, this plate is also Specification of LettersPatent.

1917. Serial No. 164,160.

provided with slots adapted to engage projecting lugs in the housing orcover plate of the set. There is also provided an opening in this platefor the mounting of the transmitter, so arranged that the transmitterand plate are clamped to the housing by the same screws. n

The various features of this invention will be more clearly understoodby'reference to the accompanying drawings, in which- Figure 1 is a sideelevation showing the method of mounting the apparatus plate, togetherwith the transmitter, in the housing of the set, and also showing thehousing mountedon its wall plate;

Fig. 2 is a view, looking into the back of the set, showing in detailthe type of apparatus mounting plate provided; and to more clearly showthis plate, the ringer has been taken away.

In Fig. 3 is shown the type of mounting plate proposed.

Referring more particularly to Figs. 1 and 2, there is providedv anapparatus mounting plate having a ring-shaped body portion S, andextended portions which are bent up, as shown, to provide mountingbrackets 9 vand 10. These brackets have mounting surfaces in the saineplane, and are adapted for the mounting of the terminal plate 11,A whichis of fiber or other suitable material. This terminal plate, which isheld to the brackets by means of the screws 12, is equipped withsuitable `terminals of a suiiicient number to provide ,a flexible meansfor connecting the circuit Awiring to meet the requirements of thevarious systems. On thev bracket 9 is also mounted a switchhook, whichconsists of the body portion 18, operating lever 14, and spring pile-up15. As shown, the switchhook is adapted for use where the operatinglever extends through the side of the case, and it is fastened to thebrackets by means of screws 16, which pass through clearance holes inthe bracket, and engage threaded holes in the body portion of theswitchhook. Additional lugs 17, 17 are bent up at right angles to theface of the bracket 9, and are provided with mounting holes 18, 18,corresponding to those in the face of the bracket, and permitting` themounting of the switchhook in a position displaced ninety degrees fromthe position in which it is shown. thereby making it possible to use thesame mounting plate and the saine switchhooli for either the llush orthe non-flush type of sets. On the ring portion of the plate arefastened a plurality of insulating segments 19 preferably of fiber or asimilar material, and to these segments are fastened, by means oi thescrews 20, spring members 21, which are adapted to bear against thetransmitter capsule 22 and hold it in position against the back side oftransmitter front plate 27, the inner diameter of the ring portion beingof suitable dimension to allow the transmitter capsule 22 to extendtherein. Since the spring members 2l are insulated from the mountingplate, the transmitter connection may be made directly to one of thespring members if desirable. Symmetrically located on the ring portionare the slots 23, which are of suitable dimensions to engage the lugs 24on the housing 25, and to holdy the apparatus plate in position. lt isthen secured by means of the screws 26 passing through the front plate27 or" the transmitter, and engaging the threaded Vholes 28 in theapparatus mounting plate, lthereby locking the parts together:

It will be noted that, with this construetion, the transmitter isremovable from the front, Vthereby permitting a more compact arrangementof the apparatus within the housing than would otherwise obtain.Moreover, the other apparatus is not disturbed by the removal of thetransmitter, and the same screws which are used to hold the transmitterin place also secure the apparatus mounting plate.

Referring now more particularly to Fig. 3, there is provided a mountingplate 2S) which is adapted to be secured to the wall by means of screwspassing through the mounting holes 30. An opening 31 is provided throughwhich to bring the wiringi'or the set, and recessed portions 32, 32 arealso provided at the top and bottom of the plate as alternative openingsfor the wiring. The

lower portion of the plate is formed asY shown to provide brackets 33,33, each of which is provided with an opening or slot 34. On the lowerpart of the housing are the lugs 35, 35 of suitable dimensions to engagethe slots 34, and to serve as a support for the housing while theconnections are being made in the interior wiring or the apparatusitself. As a means for securing Leer/,eee

the housing to the mount-ing plate, rightangled brackets 36 are formedin the'latter, these being provided with threaded holes 37, adapted tobe engaged by the -screws 33 passing through the sides of the housingThese screws are provided with split washers 39 to prevent their fallingout when not in use. A U-shaped guide 40 is provided tor the wiring tothe set, which is preferably run in cable form. For the sake ofclearness, this wiring is not shown in the drawings.

What is claimed is:

1. In a telephone set, the combination with a housing having an openingtherein. of an apparatus mounting plate located within said housing andcomprising a ilat body portion having an opening therein adapted toregister with the opening in the housing, a transmitter iront platemounted external of the housing, and a transmitter capsule mountedwithin said openings and held under pressure against said transmitterfront plate. v

2. In a telephone set, the combination with a housing having an openingtherein, of an apparatus mounting plate located vWithin said housingand-comprising a `flat` body portion having an opening thereinregistering with the opening in the housing, a transmitter front platemounted external oit the housing, a transmitter capsule mounted withinthe housing and extending within said openings, and a plurality ofspring members mounted upon and insulated from said mounting plateadapted to-hold said capsule in position against the rear wall of thetransmitter iront plate, whereby said capsule may be removed `from thefront upon removal ofthe transmitter front plate.

3. In a telephone set, a mounting plate comprising avila-t body portionhaving an Y opening suitable for-mounting a transmitter, abent upextension on said plate provided with means for mounting a switchhook,and lugs formed on said extension and at right angles theretoadapted toprovide an alternative means et securing said switchhook in a positionat right angles to said other position. Y

In witness whereof I hereunto subscribe my name this 20th day of AprilA. D., 1917.

WALTER e. onAwroi-m,

